Would not be difficult to have a silenced .22 rifle put a round into his side, just so he would reach for it.
Having had the same thought, I tried it on an old heavy coat. Depending on the round (Fiocchi and Gemtech Subsonic listed at 1020 and 1010 fps, CCI quiet at 710 fps, Aguila Super Colibri at 500 fps, and Aguila Colibri at 375 fps), they were all very quiet when fired from a silenced bolt action rifle with a non-metal target six inches behind the coat. Fiocchi, Gemtech, and CCI penetrated the coat, although they all gave it a good push.
That would require premeditation, and I expect better from the FBI, no matter how evil their boss's boss is. I don't think even Obama's FBI would go quite that far, I hope, but I've been wrong just about every other time I though even Obama wouldn't stoop "that low" and he went even lower.